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ggml : dynamic ggml_sched_max_splits based on graph_size #9047

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Aug 16, 2024
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ggml : dynamic ggml_sched_max_splits based on graph_size #9047

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ggml : Dynamic ggml_sched_max_splits based on graph_size
nicoboss Aug 15, 2024
fe40950
Fixed and readded debug code for causes
nicoboss Aug 16, 2024
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13 changes: 5 additions & 8 deletions ggml/src/ggml-backend.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1018,10 +1018,6 @@ static bool ggml_is_view_op(enum ggml_op op) {
#define GGML_SCHED_MAX_BACKENDS 16
#endif

#ifndef GGML_SCHED_MAX_SPLITS
#define GGML_SCHED_MAX_SPLITS 2048
#endif

#ifndef GGML_SCHED_MAX_SPLIT_INPUTS
#define GGML_SCHED_MAX_SPLIT_INPUTS GGML_MAX_SRC
#endif
Expand Down Expand Up @@ -1125,7 +1121,8 @@ static int ggml_backend_sched_backend_from_buffer(ggml_backend_sched_t sched, co
}

#if 0
static char causes[GGML_DEFAULT_GRAPH_SIZE*16 + GGML_SCHED_MAX_SPLITS*GGML_SCHED_MAX_SPLIT_INPUTS][128]; // debug only
#define GGML_SCHED_MAX_SPLITS_DEBUG 4096
static char causes[GGML_DEFAULT_GRAPH_SIZE*16 + GGML_SCHED_MAX_SPLITS_DEBUG*GGML_SCHED_MAX_SPLIT_INPUTS][128]; // debug only
#define SET_CAUSE(node, ...) sprintf(causes[hash_id(node)], __VA_ARGS__)
#define GET_CAUSE(node) causes[hash_id(node)]
#else
Expand Down Expand Up @@ -1549,7 +1546,6 @@ static void ggml_backend_sched_split_graph(ggml_backend_sched_t sched, struct gg
sched->splits = realloc(sched->splits, sched->splits_capacity * sizeof(struct ggml_backend_sched_split));
GGML_ASSERT(sched->splits != NULL);
}
GGML_ASSERT(i_split < GGML_SCHED_MAX_SPLITS);
split = &sched->splits[i_split];
split->backend_id = node_backend_id;
split->i_start = i;
Expand Down Expand Up @@ -1865,13 +1861,14 @@ ggml_backend_sched_t ggml_backend_sched_new(
sched->hv_tensor_backend_ids = malloc(sched->hash_set.size * sizeof(sched->hv_tensor_backend_ids[0]));
sched->hv_tensor_copies = malloc(sched->hash_set.size * sched->n_backends * sched->n_copies * sizeof(struct ggml_tensor *));

const size_t nodes_size = graph_size + GGML_SCHED_MAX_SPLITS*GGML_SCHED_MAX_SPLIT_INPUTS*2;
const size_t ggml_sched_max_splits = graph_size; // at most there is one split for each node in the graph
const size_t nodes_size = graph_size + ggml_sched_max_splits*GGML_SCHED_MAX_SPLIT_INPUTS*2;
sched->node_backend_ids = calloc(nodes_size, sizeof(sched->node_backend_ids[0]));
sched->leaf_backend_ids = calloc(nodes_size, sizeof(sched->leaf_backend_ids[0]));
sched->prev_node_backend_ids = calloc(nodes_size, sizeof(sched->prev_node_backend_ids[0]));
sched->prev_leaf_backend_ids = calloc(nodes_size, sizeof(sched->prev_leaf_backend_ids[0]));

sched->context_buffer_size = GGML_SCHED_MAX_SPLITS*GGML_SCHED_MAX_SPLIT_INPUTS*2*sizeof(struct ggml_tensor) + ggml_graph_overhead_custom(graph_size, false);
sched->context_buffer_size = ggml_sched_max_splits*GGML_SCHED_MAX_SPLIT_INPUTS*2*sizeof(struct ggml_tensor) + ggml_graph_overhead_custom(graph_size, false);
sched->context_buffer = malloc(sched->context_buffer_size);

const int initial_splits_capacity = 16;
Expand Down
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